I bought a 5115M about 3 years ago, been a rock solid tractor, no issues. Completely agree with all the previous comments , the euro quick mount is the only way to go even if you had to replace your current attachments.
Another thing to consider is which loader to go with. I’ve got the 540m loader on my 5085E and went with the 540r loader on the 5115M . Both are rock solid and each has it’s slight advantages. I like the 540m for it’s longer reach , excellent for pushing burning brush piles together and keeping the rest of the tractor at distance away from hot coals. 540R advantage is its compactness, doesn’t stick out as far and aids in maneuverability. Bought the 540M separate from tractor and installed myself.
I think you’d definitely like the 5M , they may be a bit pricier but you get what you play for